WASHINGTON — Around 5:30 each morning, President Trump wakes and tunes into the television in the White House’s master bedroom. He flips to CNN for news, moves to “Fox & Friends” for comfort and messaging ideas, and sometimes watches MSNBC’s “Morning Joe” because, friends suspect, it fires him up for the day.

Energized, infuriated — often a gumbo of both — Mr. Trump grabs his iPhone. Sometimes he tweets while propped on his pillow, according to aides. Other times he tweets from the den next door, watching another television. Less frequently, he makes his way up the hall to the ornate Treaty Room, sometimes dressed for the day, sometimes still in night clothes, where he begins his official and unofficial calls.